Bird shelf



FIG. 1 is a perspective view of bird shelf showing my new design;

FIG. 2 is a front elevational view thereof; with the rear side being a mirror image of that shown;

FIG. 3 is a left side elevational view thereof; with the right side being a mirror image of that shown;

FIG. 4 is a top side elevational view thereof; and,

FIG. 5 is a bottom side elevational view thereof. 

The ornamental design for bird shelf, as shown and described. 